Kiln.



erarsarnrir arriba.

KILN.

Specification of Letters Patent.

Patented dan..` 8, 1918.

Application led January 29, 1916. Serial No. 75,157.

To all whom z't may concern:

Be it known that I, STEPHEN Gr. JOHN sToN, a citizen of the UnitedStates, residing at Barboursville, in the county of Cabell and State ofWest Virginia, have invented new and useful Improvements in Kilns, ofwhich the following is a specification.

This invention relates to kilns, and it has particulary reference tothat type of kilns in which gas is used as a fuel. l

The invention has for its object to produce a` kiln which may be iredalong the center, as well as along the sides, as has heretofore beencustomary in kilns where' gas is utilized as a fuel, thereby enablingthe heat to be thoroughly equalized within the kiln and also promotingthe facility with which the temperature may be regulated and varied.

A further object of the invention is to produce a simple and improvedcenter fired gas-heated kiln of a construction` whereby the gas main, aswell as the means for supplying atmospheric air to support combustionwill be safeguarded and made ready of control and regulation.`

A further object of the invention is to simplify'and improve thevconstruction and arrangement of the burners as Well as the means forsupplying gas and air to support combustion.

With these and other ends in view which i will readily appearl as the'nature of the invention is better understood, the-same consists in theimproved construction and novel arrangement and combination of partswhich will be hereinafter fully described and particularly pointed outin the claim.

In the accompanying drawingshas been illustrated a simple and preferredform of the invention, it being, however, understood that no limitationis necessarily made to the precise structural details therein exhibited,but that changes, alterations and modifications within the scope of theclaim may be resorted to when desired.

ln the drawings,-

Figure 1 is a vertical sectional view taken longitudinally through akiln constructed in accordance with the invention.

Fig. 2 is a transverse sectional view taken on the line 2 2 in Fig. 1.

Fig. 3 is a sectional detail view, enlarged, of one of the burnersshowing the means for supply gas and :pc/i air..

Fig. 4 is a transverse sectional view taken on the line H in Fig. 3. y

Fig. 5 is a transverse sectional view illus trating a modified form ofthe invention.

Fig. 6 is a longitudinal sectional view extending part wav through thekiln and illus- V walls being pierced along their lower portion by rowsof eyes 18. Rows of burners B are arranged exteriorly of the kilnadjacent to the eyes or openings 18, and these burners may be of thegeneral construction shown in my previous Patent No. 1,134,863, datedApril 6, 1915.

Extending' longitudinally of the kiln, a short distance below the floorlevel 19, is an air duct 20 which may be constructed of tiling, brickwork or the like, said duct being provided at intervals with upwardly extending branches which may likewise be constructed of clay tiling or thelike, and which may be connected with the main ductl in any convenientmanner. 21 are permitted to extend a short distance, say from two tothree inches above the floor level, and the duct 2O will preferably belaid from 18 to 211 inches below the floor level. `lilxtending thebranch pipes 21 above the Hoor level., as just described, not onlyprevents dirt and rubbish from dropping through said branch `pipes tothe main air duct where obstructions would thus presently be found, butit also lessens the liability of the gas issuing through said branchpipes from being interfered with by confiicting air currents enteringthrough the eyes 18 and interfering with the ready combustion of the gasmixture. Extending through the air duct 20 and supported in the lowerpor tion thereof is a gas main 22 having upwardly extending gas tubes 23which are dise4 posed axially with respect to the ducts or branches saidgas tubes being of such length as to proj ect into the lower ends of theducts 21. Each gas tube is provided with a cap 24 through which one ormore apertures 25 will. be drilled for the escape of the gas.. llhe Thebranches gas Inainis provided with a controlling valve 26. The air duct20 may be opened for the intake of atmospheric air at one or both ends.In Fig. l of the'drawings one `end ofA the air duct which is thus openfor the intake of air opens into a ditch 27.

As will be seen by reference to Fig. 1 of thedrawinga theA burners arearranged in alinement with the eyes 18 in the side wallsr to. assist incooling the contents of the kiln.

While the process of burning is going on the products of combustion willescape in the customary manner through openings below the roof of thekiln.

ByeXtending the gas main through the airduct, as herein described, andproviding the` air` duct with, lupwardly extending branches thatsurround the upper ends of the gas tubes communieating` with thegasmain, the gas will be provided with a proper admixture of air tosupport combustion, it being evident that by the controlling valve 26the quantity of gas escaping through the gas tubes will be controlled.Under the arrangement shown and described the row of burners will extendlongitudinally and centrally through the kiln, the contents of whichwill thus be heatedV equally and in a more thorough and effective mannerthan by the means heretofore employed,

It may at times be desirable to produce a construction whereby the flowof gas to the burners located midway between the sides of the-` kilnmaybe individually controlled, as wellyas the supply of air to form aproper miXture-withfthe-gas. When this is'the caser tlieconstructionillustrated in Figs..5 and 6 is`.,resortedto. By vthis construction aplu.-

ralityof'air pipes 30'are provided, said pipes beinglaidbelowthe floorofthe kiln andex.-

tending from one side tol a point y,midway l; bet-,Ween the sides ofthekiln.

These airy pipes orzducts are closedat their inner ends andareprovidednear theirinner ends with controlled by an angle` cock 36., andthe flowV of air throughthe duct 30 may be controlled by. means ofshutters 37 atthe outer end of theduct 30. It is `evide'ntthat by thisconstruction the flow of gasand air to the burners extending centrallythrough, the v kiln may be `individually controlled, thus enablingtheheat fromthe center burnersto be absolutely regulated.`

Having thus described theinvention, what is claimed asvnew, is

In a gas' kilnhaving itssides kprovided withopenings, anexteriorlyarranged longitudinally. extending gas supply pipe at eachA side ofthekiln, individually controllable air supply pipes, disposed atthebottomof said openingS and extending horizontallyinto the kiln, individually`controllable gas tubes connected with said Vgas supply pipesv and,`

' extendinginto said: air pipes,V horizontally arranged individuallycontrollable air supply pipesextending transversely intoV 'the kilnbeneath the floor thereof Vand disposed below and in alinement with saidfirstnamed air supply pipes and terminating at the longitudinal centerline of` the kiln, verticalv branch pipes communicating with the innerends lof said second named' air pipes and extend-ing into the kilninalinement with said' rs't named.. air pipes,A individually control-`lable gas pipes 1n said last nained'air pipes and communicating, withone of saidA gas supplyfpipes, landjjgas tubes `connected"with said.lastnarnedgas pipes, and extending into saidrvertc'al branchlpipes.;

-In testimony fwherectilv an'iX mysignature in presenceoftwotwitnesses..

STEPHENegJoHNsToN.

Vitnesses:

copies, oli this patent may be obtained for five cents each,bywaddressingvthe Commissioner o f,'1a1:en ,cs,V

Washington, D; f1.-

